#rig.formation  formation of masts, spars, sails, etc., on a vessel
  supertype:  #formation.arrangement  a particular arrangement
  subtype:  #Bermuda_rig__Bermudan_rig__Bermudian_rig__Marconi_rig  a rig of triangular sails for a yacht
  subtype:  #cat_rig__catrig  rig of a catboat
  subtype:  #fore-and-aft_rig  rig in which the principal sails are fore-and-aft
  subtype:  #lateen-rig  the rig on a lateen-rigged sailing vessel

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